Réponses

2014-03-11T21:20:10+01:00
A= 2x + 4- (8x - 9)
 = 2x+4-8x+9
 = -6x+13

B= 3a -7 - (2a+5)+(3a-10)
 = 3a+7-2a-5+3a-10
 = 4a-3-5
= 4a-8

C= 3t +1 - (4 - 6t) +[12 - (3 +t)]
=3t+1-4+6t+12-3-t
= 8t+6

D = - (x + 5) - x - 2 - [3 - (- x- 4) +5]
 = -x-5-x-2-3-x+4-5
 = -3x-11